package main.java.controller;

import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import com.google.code.kaptcha.Producer;

@Controller
@RequestMapping("/kaptcha")
public class KaptchaController		{
	@Autowired
	@Qualifier("kaptchaProducer")
	private Producer captchaProducer = null;

	@RequestMapping(method=RequestMethod.GET, value="/getKaptcha.do")
	public ModelAndView getKaptchaImage(HttpServletRequest request,
			HttpServletResponse response) throws IOException {
		response.setDateHeader("Expires", 0);
		
		// Set standard HTTP/1.1 no-cache headers.
		response.setHeader("Cache-Control","no-store, no-cache, must-revalidate");

		// Set IE extended HTTP/1.1 no-cache headers (use addHeader).
		response.addHeader("Cache-Control", "post-check=0, pre-check=0");

		// Set standard HTTP/1.0 no-cache header.
		response.setHeader("Pragma", "no-cache");

		// return a jpeg
		response.setContentType("image/jpeg");
		
		// create the text for the image  
        String capText = captchaProducer.createText();  
          
        // store the text in the session  
        request.getSession().setAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY, capText);  
          
        // create the image with the text  
        BufferedImage bi = captchaProducer.createImage(capText);  
        ServletOutputStream out = response.getOutputStream();  
          
        // write the data out  
        ImageIO.write(bi, "jpg", out);  
        try {  
            out.flush();  
        } finally {  
            out.close();  
        }  
        return null;
	}
	
}
